sup,
ever clicked an ability and then thought right after, " that was retarded".?
Well abilitys only go live after you let go of the button you clicked. So this means that if you have windowed mod (visible processer line,) you can "undo" the click.
Lets say you have a binding on R. You press R and think, hey i shouldnt have done that.. Then you can just press the processer line and let go on the button and then tap right into the game again without releasing the ability.
.. ye i know.